Steam-boiler.



UNITED STATES PATENT union.

DAVID FITZGI'BBON S, OF OSWEGO, NEW YORK, ASSIGNOR TO FITZGIBBON S BOILER 00., OFSAME PLACE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 681,365, dated August 27, 1901.

Application filed July 28, 1898. Seria1No, 687,148. (No model.)

To all whom it may concern.-

Be it known that I, DAVID FITZGIBBONS, of

Oswego, in the county of Oswego, in the State of New York,have invented new and useful Improvements in Steam-Boilers, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to improvements in boilers for steam or hot-water heating and the object is to increase the efficiency of the boiler and to economize in fuel.

To this end myinvention consists in the combination of an inverted- U -shaped boiler having fire-tubes extending through the furnace and connecting the legs of the boiler together and a bent water-tube .above the straight water-tubes connecting the said legs together; and my invention consists in certain other combinations of parts hereinafter described, and specifically set forth in the claims.

In the drawings hereto annexed and forming a part of this specification, Figure 1 is a transverse vertical sectional View taken on line or w of Fig. 2, and Fig. 2 is a longitudinal vertical sectional view taken on line y y of Fig. 1.

Referring specifically to the drawings, A is the outer inverted-U-shaped shell of the boiler, and A is the inner in verted- U -shaped shell. The upper curved ends of the shells are not concentric, but widelyseparat-ed to allow space for the horizontal tire-tubes B between them, While the sides forming the legs of the boiler are in comparatively close proximity. The sides of the inner shell do not reach to the base, but are united to the inner sides of the shell A by a single row of bolts or rivets a, passing through the sides and horizontal bars I) I), located between the sides. Stay-bolts or rivets c 0 also pass through the sides of these shells at the junction of the straight sides of the inner shell with the arched portion.

0 represents the grate-bars of the furnace, which are secured, as usual, to a sliding bar 0, connected at one end to a lever O for operating the grate.

cl d d d are four water-tubes, two at each end of the boiler and extending across between the legs thereof, connecting them together, thus afiording perfect circulation of the water through the boiler. These tubes d d, &c. are in close proximity to the grate and pass through the incandescent coal and provide a great heating-surface.

The inner shell A does not extend to the ends of the outer shell, but is provided, as shown, with heads which are outwardly 6o flanged to receive the rivets j, passing through the outer shell.

D in Fig. 2 indicates the water-supplyopeh ing in one side of the outer shell.

E is the bent water-tube extending between '6 5 the curved sides of the inner shell A, which serves still further to permit perfect circulation between the sides of the boiler. This tube being curved enters the curved Walls substantially at right angles thereto, which allows good junctions to be made at its ends and at the same time is adapted to vary its curvature when expanded and contracted, due to heating and cooling.

F is a vertical baffle-plate at the rear end of the boiler directly under the curved Water-tube, and F is an inclined baffle-plate connecting the upper edge of the vertical plate with the vertical end plate A of the boiler. The inclined baffle-plate is provided with continuous ledges ff, &c., on its upper side to hold ashes or the dust caused by com bustion thereon to protect the plate.

Directly below the center of the bent pipe E in the inclined baffle-plate is one or more nipples e, provided with air-openings, the air being admitted from the outside through opening g. The lid of opening g is provided with an adjusting screw to regulate the ad-' mission of air. These air passages are advantageous for starting up or forcing the furnace, and the nipples e 6 being arranged near the curved water-tube the latter gets full result of the increased heat generated at this point.

it h are plugs for cleaning out straight tubes or replacing them by others when burned out, and H H are the usual and Wellknown hand-holes opposite the ends of the curved tube for the same purposes. All too openings are preferably reinforced and the The space between doors are made double.

the lining G and shell may be filled in with asbestos or other suitable material, but an airspace between the plates is sufficient.

I indicates the smoke-pipe at the front end of the boiler, mounted on a projection t'. Be-

low the projection is an inclined door J for.

cleaningout. The door K serves also for cleaning out. It will be apparent that the curved tube is located in the best possible position for receiving heat.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a boiler, the combination of an inverted- U -shaped boiler having fire-tubes extending horizontally and longitudinally therei n,straight water-t ubes extending transversely connecting water-legs on each side, a bent water-tube at the rear end of the boiler above, the straight tubes at that end, secured to the inner shell on each side substantially at right angles to connect the legs together, and extending across the mouth of the fireflue.

2. In combination in a boiler having de pending water-legs on each side, straight water-tubes at each end extending transversely between the legs, a curved water-tube connecting the curved inverted walls of the shell, arranged toward the rear of the fire-box,above one pair of the straight tubes and adjacent to the outlet-flue, hand-holes in the outer shell opposite the ends of the water-tubes,

, and plugs for closing said hand-holes.

, 3. In a boiler, the combination of an inverted- U -shaped boiler having fire-tubes extending horizontally and longitudinally therein, straight water-tubes extending transversely and communicating with the lower ends of the legs of the boiler, and a bent water-tube near one end of the boiler above the straight water tubes and connecting the curved inner sides of the legs together, a vertical baffle-plate below the bent tube, and an inclined baffle-plate between the upper edge of the Vertical baiile-plate and the end plate of the boiler, as set forth.

4.. In a boiler, the combination of an.in verted- U shaped boiler having fire-tubes extending horizontally and longitudinally therein straight water-tubes extending transversely and communicating with the lower ends of the legs of the boiler, and a bent water-tube near one end of the boiler above the straight Water tubes and connecting the curved inner sides of the legs together, avertical baffle-plate below the bent tube, an inclined baffle-plate between the upper edge of the vertical baffle-plate and the end plate of the boiler, and continuous ribs on the upper side of the inclined plate, substantially as described and shown.

5. In a boiler, the combination of an inverted- U -shaped boiler having fire-tubes extending horizontally and longitudinally therein, straight water-tubes extending transversely and communicating with the lower ends of the legs of the boiler, and a bent water-tube. near one end of the boiler above the straight water tubes and connecting the curved inner sides of the legs together, a vertical baffle-plate below the bent tube, an inclined baffle-plate between the upper edge of the vertical battle-plate and the end plate of the boiler, ribs on the inclined plate, and airholes in the inclined plate below the bent tube, substantially as described and shown. In testimony whereof I have hereunto signed my name.

DAVID FI'IZGIBBONS. 

